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IAUC 8714: COMET P/2006 K2 (McNAUGHT); C/2006 F5-F8, C/2006 G2

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                                                  Circular No. 8714
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2006 K2 (McNAUGHT)
     R. H. McNaught reports his discovery of another comet with a
20" coma on Uppsala Schmidt images taken in poor seeing (discovery
observation tabulated below).  Better images obtained by McNaught
in good seeing on May 23.6 UT show a strong central condensation
and a weak coma with a diameter of 20", extended slightly in p.a.
300 deg.  Following posting on the 'NEO Confirmation Page', R.
Trentman and R. Fredrick (Louisburg, KS, 0.75-m reflector) report
that their CCD images obtained on May 23.2-23.3 show a diffuse coma
several arcsec in diameter.

     2006 UT             R.A. (2000) Decl.       Mag.
     May  22.64208   15 33 16.38   -28 22 37.4   17.7

The available astrometry, the following preliminary orbital
elements, and an ephemeris appear on MPEC 2006-K32.

     T = 2006 Aug.  3.842 TT          Peri. = 256.183
     e = 0.49732                      Node  =  13.158   2000.0
     q = 2.02900 AU                   Incl. =   6.468
       a =  4.03634 AU     n = 0.121541     P =   8.11 years


COMETS C/2006 F5-F8 AND C/2006 G2 (SOHO)
     Additional comets have been found on SOHO website images (cf.
IAUC 8713; MA = M. Mazzucato), all Kreutz sungrazers except C/2006
F6 (Meyer group).  C/2005 F5 was described by K. Battams as small,
slightly diffuse, and too faint for photometry.  C/2006 F6 was
condensed and quite elongated, reaching mag 7.6 on Mar. 22.993 UT
at 7.1 solar radii.  C/2006 F7 and C/2006 G2 were extremely faint
and diffuse.  C/2006 F8 reached mag 4.7 in C3 images on Mar. 30.571
at 12.0 solar radii; in C2 images it showed a very faint, thin tail
that reached a length of 21' on Mar. 30.922 at 5.1 solar radii,
with a possible secondary component ('lump' on the side of the head).

 Comet        2006 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2006 F5    Mar. 21.321   0 18.4   - 0 33   C3     MA   2006-K10
 C/2006 F6         22.963   0 12.2   + 2 37   C2     TH   2006-K10
 C/2006 F7         28.326   0 36.1   + 2 34   C2     RM   2006-K10
 C/2006 F8         29.654   1 00.3   + 1 58   C3/2   HS   2006-K10
 C/2006 G2    Apr. 11.246   1 27.0   + 7 33   C2     TH   2006-K29

                      (C) Copyright 2006 CBAT
2006 May 23                    (8714)            Daniel W. E. Green

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